I1819EG-08SR Datasheet PDF - Alliance Semiconductor

Part Number

I1819EG-08SR

Alliance Semiconductor

Description

Notebook LCD Panel EMI Reduction IC

I1819EG-08SR Datasheet PDF :

Product DescriptionThe P1819 is a Versatile Spread Spectrum Frequency Modulator designed specifically for input clock frequencies from 20 to 40MHz. (Refer Input Frequency and Modulation Rate Table). The P1819 reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P1819 allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations. The P1819 modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘Spread Spectrum Clock Generation’.The P1819 uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method.